Service head



1932. J. M. G. FULLMAN 1,390,050

SERVICE HEAD Filed July 8, 1929 4 Sheets-Sheet l INVENTOR.

Mall fifimfi 7/ Dec. 6, 1932. J. M. e. FULLMAN SERVICE HEAD Filed July 8, 1929 4 Sheets-Sheet 2 ATTORNE} 1932- J. M. c;v FULLMAN 1,890,050

SERVICE HEAD Filed July 8, 1929 4 Sheets-Sheet 3 IN VEN TOR.

A TTORNE Dec. 6, 1932. J, M. 5, FULLMAN SERVICE HEAD Filed July 8, 1929 4 Sheets-Sheet 4 INVETQ mitts-' M a; snwmizi ny r iriisyIQvAmA; "A'ssIeNoie: TO NATIQfiAL' QELECTBIG Pn'omicTs CORPQRATlQN{-QEPITTSBURGH?PENNSYLYALN'IE,ACORTOBA-' A pnu Killed July "s :enb i ni n m JnFP'aJ fi Wi serv e headsedz pted forus "in connectionfwlth con-"" r i c r edidu t c J in 'fecOStIV exposed conductors.

I 2Q! Afsti11 fm ther"objeot'resides in j foviding 5 an improved head fore service ext'ension con i neetion adapted to support "bushings therein, *or to. securely position ttherjein a duplex ,wreceptacle. i'

head {which will Withstand" a fgreasonable 19m construction," inexpensivei to manu andmsefulin operation.

. tures in} const -uotion, "combinationgend an i angement ofgparts as w ll be hereil afteij m' in the-Specification: and; claims; a

v 4 h n ,7 ndj1 f improvements in ,servicezheads for el ec tifi eal Still" g nothei obj ec'iifis a service recePLteicI GQ Figure 1; is "anperspective view of an ex;

tension ser yice connection, showing one 1111 v e I g pro' zed service head-inassembhd'positionif in rpviding a servieefhead of outlet Whichl' j islada'pted to encase'andhouse'a'duplexrecep? H t aj cle forfhigh v potential linesloi fa ,p a ir. of? im bushingsifor 10w potent'i'al l-linefs and protect;

T said receptacles or bushingstogethertheir fprotruding conductors oratta hment:plu s Y againstf any'ua agepr1 desttuctiongwhich" i might ordinarily oecu'i'jbyfi'eason QfQthQ GX-T "IQfposed position ofthegservice connectiong" j Another object resides in i providing e service head having complementary elements; 1Which, when applied toa stand-pi )e', provide 3 I 'a splicing chambencwheiibushingslare used h izofiinl'qconnection therewith, so thattogetherf wwijththe spece availablekwithinflthe stand-f v pipe'yainpleitoom is provided jfor splicinglrel at yelyinexp'ensive eoncealedconduetiors with improved service head, showing bushings a pplied thereto" instead of ireceptaele Figure 4 s a planfview of one of the'bush V v Figures'5,6 and 7 are d'eteil elevations of a i obu si e I "iF igulfe 8 isya side elevationof the cap sectipnof the service head, shown in Figures Land-3.-

j t Figure 9 is a botfiom plen View thereof VFigurelO is an end elevation of said cap sect-ion. f

Figure 11" is ig-n viewof the bese poi' tion of t her service. head used in Figures 1 Figure IiQ is aflverfoical section there Figure 13 end elevl ation of 'the same.

Figure 14 isa vertical; section through a slightly modified form ofjservie'e head,fshow- 1 i ingzwcircular beads? therewithina for holding. I I F'Acstill furtherpbject flg mprovldmgb the recep acle or bushing in place wka seitvice head 'whicb is compai'ative1-y.;sim

Figure 15"is-"a section'of' en office; showing? two desks hiving:-: lamps (high! potential mum fand one which will be veiy Qificient line's) fandteliphones" flowwpmentiali 'lineg);

thereon which have conductorsextending- I withithserandimimemug therefromto'nnproyed servl oeheads.

9*y1ev'v thezinventlon conslsts 1nthenove1 feae Figurelffi is}z ifont elevation of aj'receptzicle' adiptee fdf use iii "connection fwich 'the.

inipifoveclseijicehefidii ferred :to" andmore 'pa rti'culafly pointed at T i I 7 Figures 22and 23' are perspective views showing thetwo' halves-of theservice head, andvFigure 24 shows a couplingfor clamping I of which the base may be serewedtna the ine 1 v t eaded pp ien 6 Left es tflm pipe 7 of the: extension service, connection *slm'wn v Figure 20 is a'vertical cross section through a modified formof: service head, showing the with circular holding beads. I F igure 21' is an outline view thereof.

said halves-together;

; vReference being had in a-j-Figures 1' and 2 comprises i an a'rcuate;

' 7 m dotan'd dash line and indijcated 'in a gen? 1 substantially' rectangular inetallicconduit 11 I L embedded a suitable distancebelow the sur -1 faceof a floor 12,)or anyother kind of build- V partition.- {3 J i i 'eral manner by the numeral' '8. The-lower end of thestand-pipe'ihas threads 9} extend a considerable distance up p pe and is screwed into one of the suitably thread-j ed" hollow bosses 10ftormed integrally with a The extension 1 *ffiled May '15, 1,929',oby-L. Alan Sharp, ma'y, 7 therefore, "be succinctly described" as comprising the following "additionalelements: 13 I is a-v stop collar means of which "the lstandpipe'i issecurely;locked*on a boss '10;

and ,the amount of engagement therewith definitely determined ;11 4L= is afflange-plate 1, internally threaded. to engage the"lscrew-' I threads9 and adapted to'rbear' on thesuria'ce'. YQQof the flo rtr aruuan 12 ';I-andl5:i;s"af1ock- I nut serving thedualypurposeof locking the;

V flangerplate and protecting and hiding that portion of the threads 9 which would other- 1 wisebe exposed above the floor surface:

I The cap 1 -issecured/tothe base"portionf2 50 *the' inside" walls of the cap and protruding I means {of lugs '16 formed "integrally with with-in the-base portion In thelugs16lare provided threaded apertures l7' adapted to; lgreceive screws 18 inserted through counter-1 "sunk apertures 19, provided in theside' walls of the base portion andregisteringawith'said threaded apertures; 1 f I I I When highpotentialreceptacles 20cjofthe hapeshowninFigures 16 1-0 19; are used in connection with the service head, the cap and bottom portions" of tl1e;'latter are provided with suitably shaped interior beads/21 and 22 respectively which; engage special recesses or grooves 23 formedfpartly aroundfthe con; ff'tact ends 24 f the I receptacle. true-latter II same parted on a vertical plane, 'andprovided I toftliedrawings; a service head of thetype'shown in particular also "hasatgthe of the body and at both sides thereof flat bottomed recesses 25 which are engaged by the lugs-16 andby means of which the receptacle is additionally held in proper placewithin the service head.

. "Both contact ends of the receptacle are, of course, supplied with suitable apertures 26 .to *receive. the contact bladesv of electrical v attachment plugs 27 by means of which individual electrical fixtures are connected" to 4 the concealed electrical wiring."

As shown especially in Figures 1' and 2,

the ends of1the capo and base of the service head are made outwardly flaring and extend semicircular cap 1 and aworrespondingly shaped base portion 2 having at the center of its bottomwall' 3 a hollow extension'orhubr I 4, provided with internal threads 5Jby' means at I their upper: ends considerably beyond the contact faces" ofthe receptacle. The purpose :of'this'construction is toprotect the inserted attachment plugs andithe electrical wires I jconnected thereto against beingtramped on i and dama-gedr This'feature is especially valuable when; extension service connectionsfare toi be" installeddirectlyfunder ofiice desks, as 1 plainly suggestedfin Figure '15, The ends of the cap and base'f'are p'referably'provided' with outwardv strengthening beads 28 which also Qprotect the edges of the service cap the feet of a person slip off the servicehead,

I I I Qthey willgslip beyond the shearing point of seryiceeconne'ction 8, form'-; Y 'ing, pe1"se,i the'subject matter ofan'applica -s ,tion for Letters'Pa'tent Serial No. 363,334,

the wiresfconnected tothe service head. .J In' low potential underfloor wiring installation's, receptacles arefgenerally OIIllttBd 1n eled and have at their peripherytwo or more tapering grooves 30, 31,"ea1ch extending only In the cap and partly aroundthe bushing, I base of the service head are produced respecagainst to'o rapid abrasion due to desk occui pant's resting their feet thereon; or due it-o some other cause 'It'will be noted that should tively the beads; 32 and 33 which are suitably ltapered to snugly engage their respectivegi'ooves in the bushings and wherebythe latter are" properly'heldwithin the service head.

The inside'iwfalls 34of these bushings are well rounded off torproducean unobstructed Wire Way for the wires passed therethroughiand v eliminateany sharp bends in said wires. The

ends. ofthefcap" and; base are also extended considerably beyond the bushings .to afford greater protection"thereto:and to the. wires,

for tl ei same reasons as explained heretofore. 'It will beq'noted that n this arrangement,

make the. necessary splicing; connections between the, cheaper; concealed,"w1res 35 and thefrno're' expens ve and; generally silk covthe 'use. ofthe bushings affords considerable] (space withln'the service head wherein to cred, exposed, wires 136-by means of which" telephones, telegraphs, or other-low potential apparatuses are connected to a main electri I cal; circuit. .Aside of the structura1l'difleren'ces 'justf'des'cribed; the service head shown i are; a is vannogaa ltd a ent inns-mad ceptacles, or bushings, 'aremade full circular I androf unitormwidth, instead of extending only partly around the inner circumference 1 of the service head and beingslightly wedge shaped. ,yThis minor} variation is made for the purpose of adapting theservice head to slightly modified types f receptacles and l bushings. now availablein'the trade and sug gestively indicated in dot and dash lines. a

' The modified service head shbwn injFigs.

" to24is composed oitwo similar halves 38 and 39 joined together alonga vertical plane by'lneansof a-clamping ferrule l0 having internal. threads 41 adaptedto engage corre- 'sponding threads 42 cut at the lower, restrict edand semi-circular, end of each'half of the service head. ,Bothhalves] areffirst united by a means of the ferrule 40, and the service head is then screwedonto the upper, [outwardly I threaded, end of the standgpipe 7 suitable threads 43 being provided in eachhalf of the,

service head for this purpose. fInthe present embodiment, the service headis shown provided with full circular holding beads 44 i ofuniform,widthand bothouterends of' the I I service'head arealso extendedasuitable distance beyond the beads, to protect the recep tacles or bushings mountedtherein. 1

' ":Many changes in the precise construction i q and arrangement of thevarious parts'may be made without exceeding-the scope of the 4 i'changes as may b thought desirable is hereby reserved. i i 'i i r IWhat is claimed is? claims; and the liberty of making allfisuch 11A? head for an extensionservicelcon- I 'nection adapted to receive "grsubstantially cylindrical receptacle vand comprising 1on gitudinally and transversely arcuate comfplementary sections removably secured to I ether; complementary ribs'positioned on the plnnerwalls of said sections and in" partial peripheral engagementwith said receptacle,

I the ends of said" head tapering inwardly to 'ward the bottom thereof *towprovide overhanging projections at 'the top {ends of said head adapted to receptacle.

protect from the top said i 2. In an head to said standpipe; converging ribs positioned on theinner'walls ofysaid sections ladj acent the ends thereof andinpartialpe- *3.'-1In:. an! extensions servicecconnecti onhlar standpifpea threaded i at its; upper end and. a;- I head therefor adaptedwtorreceivea substan= ti ally ,cylindrical: :receptacle and comprising complementary sections removably securedtogethergzmeans:for'Lremovably securing the; i a

head to said standpipeyconverging ribs positioned on the; inner'gwalls of said sections adj acentwthetends thereof; and in partial peripheral-i engagement. with said receptacle to securei'zsamewithin-the headeagainst loin gitudinal I and 1 rocking; movement; :the end' edges ot said .head being inclined inwardly to providet overhanging projections adapted" 1 to protect saidvreceptacle andelectric wires? immediately connected :jthereto; and exterior reinforcing beads formed: integrally with; and at: the edges of said: projections 4; Ahead for. an" extension service: connection adaptednto receivea substantiallycylin dricaln receptacle andscomprising longitudii-.

nally rand transversely al enate complemenfrom the upper tothelower portions thereof lea tary sections removably secured together;

complementary convergingribspositioned'on the inner walls of said sections and impartial peripheral engagement withc said receptacle to secure sameagainst longitudinal and rocking movement; the ends of said head tapering inwardly toward the bottom thereof to provide overhanging-projections at the top endslof'said head adapted to protect from the top said receptacle, and exterior reinforcingbeads of parti-circular cross-section formed integrally with and at the edges of said projections. a

5. A headforan extension service connecplementary sections removably secured together; said head being-arcuate in 1 longitudinal section and comprising a base portion and a complementary cap in arcuate con- "ner walls of said head adjacent the ends a i i thereof andin partial peripheral engagement extension service cjonnectioin a q st'andpipethreaded at its upper end and a head therefor adapted to receive a substan may cylindrical receptacle and comprising complementary sections removably secured together; means for .vremov'ably securing the of said head adapted to protect from the top said receptacle.

6. Ahead for an extenslon service connection adapted to receive a substantially cylindrical receptacle and comprising a base portionand acomplementary cap portion in tion adapted to receive a substantially cylini dricalreceptacle and includinga pair of com- V arcufiiteicontaet relation therewith;;lugs posiix T i tioned 011 the'in'eide of one ofsanid portions; i

- andfadapted. to interiorly engage the other' portion; .means 'for removablyeecuring said.

portions together zconvergifng ribs po si tioned on the'inne'r walls of said head in par-- tial peripheral engagement with said *recepandelect ric Q F7'I A service 1 tacle; said-rlugsend.ribsv being severally a'daipted'to seCure 'saidreceptacle within said head against longitudinal and rockingmovement,' -and-the e1ids of said head extending be-" f yond seidgribsfltoprovide overhanging pro- Jections adapted-to protect said receptaclef ires immediately -connected *pthevr'etow i ,:1 :fittilig comprising in c o'nolo'iiia-w v 1 'j tion, aistandpi-pe', a'hea d fitted-on said stand-Q 7 pipe'agid a' condutor receiving device'm'ounte v, v V

' ed in said heada nd having Substantially horii- .7 ,i ,vzonta'lconductor-receiviiig openings; said heed having an upper-substantially laterally f 51 extending flange to protect said device vand 1 "conductors deceivedtherebyifrome outside r 'inechanical inj-uryifr'om abovefl v r 8. A 'ervice. fitting comprising-a .standpipe,- a head fittedlonthe top of said'sta'nd- .pipe', at cord-conneeting receptacle mounted "Lin saidhead saidheadheming'z lflangeprmv jecting from the upper part thereof beyond 1 the feceptacle to protect the receptacle and,

injuryI- q. I :testimo y; whei'eof I have affixed m cord connection against outside mechanical signature;

- i-qAj'ME'slMgGi FULLMANR 

